Description
In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | botan | 2.17.3+dfsg-1 | — |
| Debian 12 | botan | 2.17.3+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | botan | No fix yet | — |
| Ubuntu 18.04 LTS | botan +1 | No fix yet | — |
| Ubuntu 16.04 LTS | botan1.10 | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | botan1.10 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP2 | Botan | 2.10.0-bp152.4.3.1 | openSUSE-SU-2021:0794-1, openSUSE-SU-2021:0765-1 |
| SUSE Package Hub 15 SP1 | Botan | 2.10.0-bp152.4.3.1 | openSUSE-SU-2021:0765-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | Botan | 2.10.0-bp152.4.3.1 | openSUSE-SU-2021:0765-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.21 | botan | 2.17.3-r0 | — |
| Alpine v3.20 | botan | 2.17.3-r0 | — |
| Alpine v3.19 | botan | 2.17.3-r0 | — |
| Alpine v3.18 | botan | 2.17.3-r0 | — |
| Alpine v3.17 | botan | 2.17.3-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.16 | botan | 2.17.3-r0 | — |
| Alpine v3.15 | botan | 2.17.3-r0 | — |
| Alpine v3.14 | botan | 2.17.3-r0 | — |
| Alpine v3.13 | botan | 2.11.0-r6 | — |
| Alpine v3.12 | botan | 2.11.0-r6 | — |
| Alpine v3.11 | botan | 2.11.0-r4 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | botan2 | No fix yet | — |
Advisories 2
- openSUSE-SU-2021:0765-1 Security update for Botan SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0794-1 Security update for Botan SUSE / openSUSE Security Updates · Feb 4, 2026